Hey, basically its very good. there is two sides, the vampire lords and the hunters. You get to choose which side you want and you gain perk trees for the vampire overlord transformation which is new and the werewolf so they now have powers when they get leveled up. Overall it is a great investment. Ps also new weapon the crossbow which is especially made for fighting vampires and a new dead horse which you summon to ride but doesnt fight which is good if your a stealthy character. The whole add on lasts for about 5 hours.